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CoCrNi medium-entropy alloy and technology for preparing CoCrNi medium-entropy alloy through atomization powder preparation method

A technology of atomization powder milling and entropy alloying, which is applied in the field of metal materials and can solve the problems of large particles, large particle size deviation, and microsegregation.

Inactive Publication Date: 2021-09-14
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of uneven mixing, micro-segregation, large particles and large particle size deviation in the production of CoCrNi medium-entropy alloy powders in the prior art, and provide a process for producing medium-entropy alloys, specifically , is a method of producing uniform CoCrNi medium entropy alloy with no micro-segregation and fine particles by electrode induction melting gas atomization method

Method used

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  • CoCrNi medium-entropy alloy and technology for preparing CoCrNi medium-entropy alloy through atomization powder preparation method
  • CoCrNi medium-entropy alloy and technology for preparing CoCrNi medium-entropy alloy through atomization powder preparation method
  • CoCrNi medium-entropy alloy and technology for preparing CoCrNi medium-entropy alloy through atomization powder preparation method

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Embodiment 1

[0050] A kind of CoCrNi medium entropy alloy atomization pulverization preparation process, its steps are as follows:

[0051] (1) Carry out cutting and cleaning pretreatment on the single-mass block of Co, Ni, and Cr elements, and cut it into a single-mass block of the required weight by using a grinding wheel cutting machine. Cut the raw materials of each component into small pieces as large as possible by means of hand sawing, wire cutting, etc., and weigh them with an electronic balance. The amount of the substances is equal, and the mass of each elemental block obtained by final cutting is: 117.8666g of Co elemental substance, 117.3866g of Ni elemental substance, and 103.9225g of Cr elemental substance. To remove simple surface oil;

[0052] (2) Co, Ni, Cr elemental block (being metal cobalt plate, metal nickel plate, metal chromium block) of the amount of equal substance is used as figure 1 CoCrNi alloy bars are obtained by smelting in the intermediate frequency induct...

Embodiment 2

[0060] A CoCrNi medium entropy alloy atomization pulverization preparation process, the steps are as follows:

[0061] (1) Carry out cutting and cleaning pretreatment on Co, Ni, Cr element element block, cutting is to adopt the grinding wheel cutting machine to process the element mass block of required weight, and cleaning is to immerse the cut element mass into acetone solution and add ultrasonic vibration for 180 seconds , to remove simple surface oil;

[0062] (2) Melting Co, Ni, and Cr elemental blocks of equal amounts with an intermediate frequency induction furnace to obtain CoCrNi alloy rods, the respective purity of Co, Cr, and Ni elemental blocks are 99.990%, 99.993%, and 99.995%, respectively. The parameters for smelting in an intermediate frequency induction furnace are as follows: slowly increase the smelting power of the induction furnace at a speed of 7kW / 5min, so that the smelting power reaches 44kW, and the smelting time is 2.1 hours. and the single mass bloc...

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Abstract

The invention discloses a CoCrNi medium-entropy alloy and a technology for preparing the CoCrNi medium-entropy alloy through an atomization powder preparation method. The technology comprises the steps that a Co element simple substance block, a Cr element simple substance block and a Ni element simple substance block are smelted according to a specified proportion to prepare a CoCrNi alloy bar; the CoCrNi medium-entropy alloy is prepared from the CoCrNi alloy bar used as a raw material through an electrode induction melting gas atomization method. The prepared CoCrNi medium-entropy alloy is in a standard FCC phase, free of microscopic segregation, round in overall shape and small and uniform in particle size. According to the technology, smelting by a medium-frequency smelting furnace and the EIGA technology are combined, the defects that an existing CoCrNi medium-entropy alloy is uneven in mixing, has microscopic segregation and is large in particle size are overcome, and the technology is simple, suitable for large-scale production, low in cost and good in application prospect.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a CoCrNi medium-entropy alloy and its preparation process by atomization pulverization method, in particular to a medium-entropy alloy CoCrNi with uniform mixing, no micro-segregation and fine particles and its electrode induction melting gas Atomization method preparation process. Background technique [0002] Medium entropy alloys have a variety of synthesis processes, and different types of alloys can be obtained by synthesis in different forms, such as dense solid castings, powder metallurgy parts and films. Processing routes can be broadly divided into three categories, namely melting and casting routes, powder metallurgy routes and deposition techniques. Melting and casting techniques at equilibrium and non-equilibrium cooling rates have been applied to the preparation of high-entropy alloys in rod, strip, and ribbon shapes. The most commonly used melt processing te...

Claims

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Application Information

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IPC IPC(8): B22F9/08C22C30/00C22C1/02B22F1/00
CPCB22F9/082C22C30/00C22C1/02B22F2009/0836B22F2009/0848B22F2009/0896
Inventor 张睿杨瑾郑敏刘红兵赵一璇张华邓沛然魏迪严雨帆
Owner SHANGHAI UNIV OF ENG SCI
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